TITLE:
Nonlinear Coefficient Determination of Au/Pd Bimetallic Nanoparticles Using Z-Scan
AUTHORS:
José Luis Jiménez Pérez, Rubén Gutiérrez-Fuentes, José Francisco Sánchez Ramírez, Omar Uriel García Vidal, Daniel Erick Téllez-Sánchez, Zormy Nacary Correa Pacheco, Alfredo Cruz Orea, Jesús Antonio Fuentes García
KEYWORDS:
Nanofluids; Nanoparticles; Nonlinear Refractive Indices; Z-Scan
JOURNAL NAME:
Advances in Nanoparticles,
Vol.2 No.3,
July
23,
2013
ABSTRACT:
In this paper we present the nonlinear optical characterization of Au/Pd nanoparticles in order to obtain the nonlinear refractive indices using the Z-scan technique. The experiments were performed using a 514 nm laser beam Ar+, with 14 Hz of modulation frequency, as excitation source. By using a lens the excitation beam was focused to a small spot and the sample was moved across the focal region along the z-axis by a motorized translation stage. Seven samples with different concentration ratio of Au/Pd nanoparticles were prepared by simultaneous reduction of gold and palladium ions in presence of poly (N-vinyl-2-pirrolidone) (PVP) using ethanol as a reducing agent. In this work, we report the application of the Z-scan technique, to generate optical transmission of laser light as a function of the z position for solutions containing bimetallic nanoparticles of Au (core)/Pd (shell) with average sizes ranging from 3 to 5 nm. The magnitude of the obtained nonlinear refractive index was in the order of 10?8 cm2/W. Our results show that the nonlinear refractive index has a nonlinear behavior when the (Au/Pd) ratio was increased.